Be sure and talk to everyone in town...I'm not sure, but I believe that once someone tells you there is an entrance somewhere in the village, the way to the north pole will be availabe to you..then follow MARPROs advice..it is in a house..

I looked around, talked to, pushed and punched most objects in all 4 houses, and I still can't manage to find the secret entrance. Yes, I talked to the woman who informs you about the secret entrance. I just can't find it! <_<